Trend 6200/10 Tungsten Carbide Countersink Set. Designed to drill and countersink simultaneously in a wide variety of materials. Supplied with a HSS slow spiral drill bit and a hex key for adjustment. The TCT version is ideal for plywood, particle boards, and plastics (abrasive materials). Use at drilling speeds only. Not suitable for ferrous or non-ferrous metals. Ensure drill flutes are aligned with countersink flutes. For replacement twist drills, use slow spiral types (e.g., Refs 501/18 to 501/716). Specifications: Dia Metric: 15.9, Dia Imperial: 5/8, Dia2 Metric: 5.55, Overall Length Metric: 90.